.banner{
    width: 100%;
    height: 100%;
    position: relative;
}
.banner>.img{
    width: 100%;
    height: 100%;
}
.banner>.img>img{
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    border-radius: 10px;
}
.banner>.btn{
    width: 100%;
    text-align: center;
    position: absolute;
    bottom: 15px;
}
.banner>.btn>span{
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 5px;
    background-color: #ccc;
    margin: 0 10px;
}
.banner>.btn>span.active{
    background-color: orangered;
}

